<template>
	<view class="calendar-wrapper">
		<view class="header" v-if="headerBar">
			<view class="pre" @click="changeMonth('pre')">上一月</view>
			<view>{{ y + '年' + formatNum(m) + '月' }}</view>
			<view class="next" @click="changeMonth('next')">下一月</view>
		</view>
		<view class="week">
			<view class="week-day" v-for="(item, index) in weekDay" :key="index">{{ item }}</view>
		</view>
		<view :class="{ hide: !monthOpen }" class="content" :style="{ height: height }">
			<view :style="{ top: positionTop + 'rpx' }" class="days">
				<view class="item" v-for="(item, index) in dates" :key="index">
					<view
						class="day"
						@click="selectOne(item, $event)"
						:class="{
							choose: choose == `${item.year}-${item.month}-${item.date}` && item.isCurM,
							nolm: !item.isCurM,
							today: isToday(item.year, item.month, item.date),
							isWorkDay: isWorkDay(item.year, item.month, item.date)
						}"
					>
						{{ Number(item.date) }}
					</view>
					<view class="markDay" v-if="isMarkDay(item.year, item.month, item.date) && item.isCurM"></view>
					<!-- <view class="today-text" v-if="isToday(item.year, item.month, item.date)">今</view> -->
				</view>
			</view>
		</view>
		<image
			src="https://i.loli.net/2020/07/16/2MmZsucVTlRjSwK.png"
			mode="scaleToFill"
			v-if="collapsible"
			@click="toggle"
			class="weektoggle"
			:class="{ down: monthOpen }"
		></image>
	</view>
</template>

<script>
export default {
	name: 'ren-calendar',
	props: {
		// 星期几为第一天(0为星期日)
		weekstart: {
			type: Number,
			default: 0
		},
		// 标记的日期
		markDays: {
			type: Array,
			default: () => {
				return [];
			}
		},
		//是否展示月份切换按钮
		headerBar: {
			type: Boolean,
			default: true
		},
		// 是否展开
		open: {
			type: Boolean,
			default: true
		},
		//是否可收缩
		collapsible: {
			type: Boolean,
			default: true
		},
		//未来日期是否不可点击
		disabledAfter: {
			type: Boolean,
			default: false
		}
	},
	data() {
		return {
			weektext: ['日', '一', '二', '三', '四', '五', '六'],
			y: new Date().getFullYear(), // 年
			m: new Date().getMonth() + 1, // 月
			dates: [], // 当前月的日期数据
			positionTop: 0,
			monthOpen: true,
			choose: ''
		};
	},
	created() {
		this.dates = this.monthDay(this.y, this.m);
		!this.open && this.toggle();
	},
	mounted() {
		this.choose = this.getToday().date;
	},
	computed: {
		// 顶部星期栏
		weekDay() {
			return this.weektext.slice(this.weekstart).concat(this.weektext.slice(0, this.weekstart));
		},
		height() {
			return (this.dates.length / 7) * 80 + 'rpx';
		}
	},
	methods: {
		formatNum(num) {
			let res = Number(num);
			return res < 10 ? '0' + res : res;
		},
		getToday() {
			let date = new Date();
			let y = date.getFullYear();
			let m = date.getMonth();
			let d = date.getDate();
			let week = new Date().getDay();
			let weekText = ['日', '一', '二', '三', '四', '五', '六'];
			let formatWeek = '星期' + weekText[week];
			let today = {
				date: y + '-' + this.formatNum(m + 1) + '-' + this.formatNum(d),
				week: formatWeek
			};
			return today;
		},
		// 获取当前月份数据
		monthDay(y, month) {
			let dates = [];
			let m = Number(month);
			let firstDayOfMonth = new Date(y, m - 1, 1).getDay(); // 当月第一天星期几
			let lastDateOfMonth = new Date(y, m, 0).getDate(); // 当月最后一天
			let lastDayOfLastMonth = new Date(y, m - 2, 0).getDate(); // 上一月的最后一天
			let weekstart = this.weekstart == 7 ? 0 : this.weekstart;
			let startDay = (() => {
				// 周初有几天是上个月的
				if (firstDayOfMonth == weekstart) {
					return 0;
				} else if (firstDayOfMonth > weekstart) {
					return firstDayOfMonth - weekstart;
				} else {
					return 7 - weekstart + firstDayOfMonth;
				}
			})();
			let endDay = 7 - ((startDay + lastDateOfMonth) % 7); // 结束还有几天是下个月的
			for (let i = 1; i <= startDay; i++) {
				dates.push({
					date: this.formatNum(lastDayOfLastMonth - startDay + i),
					day: weekstart + i - 1 || 7,
					month: m - 1 >= 0 ? this.formatNum(m - 1) : 12,
					year: m - 1 >= 0 ? y : y - 1
				});
			}
			for (let j = 1; j <= lastDateOfMonth; j++) {
				dates.push({
					date: this.formatNum(j),
					day: (j % 7) + firstDayOfMonth - 1 || 7,
					month: this.formatNum(m),
					year: y,
					isCurM: true //是否当前月份
				});
			}
			for (let k = 1; k <= endDay; k++) {
				dates.push({
					date: this.formatNum(k),
					day: (lastDateOfMonth + startDay + weekstart + k - 1) % 7 || 7,
					month: m + 1 <= 11 ? this.formatNum(m + 1) : 0,
					year: m + 1 <= 11 ? y : y + 1
				});
			}
			// console.log(dates);
			return dates;
		},
		isWorkDay(y, m, d) {
			//是否工作日
			let ymd = `${y}/${m}/${d}`;
			let formatDY = new Date(ymd.replace(/-/g, '/'));
			let week = formatDY.getDay();
			if (week == 0 || week == 6) {
				return false;
			} else {
				return true;
			}
		},
		isFutureDay(y, m, d) {
			//是否未来日期
			let ymd = `${y}/${m}/${d}`;
			let formatDY = new Date(ymd.replace(/-/g, '/'));
			let showTime = formatDY.getTime();
			let curTime = new Date().getTime();
			if (showTime > curTime) {
				return true;
			} else {
				return false;
			}
		},
		// 标记日期
		isMarkDay(y, m, d) {
			let flag = false;
			for (let i = 0; i < this.markDays.length; i++) {
				let dy = `${y}-${m}-${d}`;
				if (this.markDays[i] == dy) {
					flag = true;
					break;
				}
			}
			return flag;
		},
		isToday(y, m, d) {
			let checkD = y + '-' + m + '-' + d;
			let today = this.getToday().date;
			if (checkD == today) {
				return true;
			} else {
				return false;
			}
		},
		// 展开收起
		toggle() {
			this.monthOpen = !this.monthOpen;
			if (this.monthOpen) {
				this.positionTop = 0;
			} else {
				let index = -1;
				this.dates.forEach((i, x) => {
					this.isToday(i.year, i.month, i.date) && (index = x);
				});
				this.positionTop = -((Math.ceil((index + 1) / 7) || 1) - 1) * 80;
			}
		},
		// 点击回调
		selectOne(i, event) {
			let date = `${i.year}-${i.month}-${i.date}`;
			let selectD = new Date(date).getTime();
			let curTime = new Date().getTime();
			let week = new Date(date).getDay();
			let weekText = ['日', '一', '二', '三', '四', '五', '六'];
			let formatWeek = '星期' + weekText[week];
			let response = {
				date: date,
				week: formatWeek
			};
			if (!i.isCurM) {
				// console.log('不在当前月范围内');
				return false;
			}
			if (selectD > curTime) {
				if (this.disabledAfter) {
					console.log('未来日期不可选');
					return false;
				} else {
					this.choose = date;
					this.$emit('onDayClick', response);
				}
			} else {
				this.choose = date;
				this.$emit('onDayClick', response);
			}
			console.log(response);
		},
		//改变年月
		changYearMonth(y, m) {
			this.dates = this.monthDay(y, m);
			this.y = y;
			this.m = m;
		},
		changeMonth(type) {
			if (type == 'pre') {
				if (this.m + 1 == 2) {
					this.m = 12;
					this.y = this.y - 1;
				} else {
					this.m = this.m - 1;
				}
			} else {
				if (this.m + 1 == 13) {
					this.m = 1;
					this.y = this.y + 1;
				} else {
					this.m = this.m + 1;
				}
			}
			this.dates = this.monthDay(this.y, this.m);
		}
	}
};
</script>

<style lang="scss" scoped>
.calendar-wrapper {
	color: #bbb7b7;
	font-size: 28rpx;
	text-align: center;
	background-color: #fff;
	padding-bottom: 10rpx;

	.header {
		display: flex;
		align-items: center;
		justify-content: center;
		height: 88rpx;
		color: #42464a;
		font-size: 32rpx;
		font-weight: bold;
		border-bottom: 2rpx solid #f2f2f2;
		.pre,
		.next {
			color: #666;
			font-size: 28rpx;
			font-weight: normal;
			padding: 8rpx 15rpx;
			border-radius: 10rpx;
			// border: 2rpx solid #dcdfe6;
		}
		.pre {
			margin-right: 30rpx;
		}
		.next {
			margin-left: 30rpx;
		}
	}

	.week {
		display: flex;
		align-items: center;
		height: 80rpx;
		line-height: 80rpx;
		border-bottom: 1rpx solid rgba(255, 255, 255, 0.2);

		view {
			flex: 1;
		}
	}

	.content {
		position: relative;
		overflow: hidden;
		transition: height 0.4s ease;

		.days {
			transition: top 0.3s;
			display: flex;
			align-items: center;
			flex-wrap: wrap;
			position: relative;

			.item {
				position: relative;
				display: block;
				height: 80rpx;
				line-height: 80rpx;
				width: calc(100% / 7);

				.day {
					font-style: normal;
					display: inline-block;
					vertical-align: middle;
					width: 60rpx;
					height: 60rpx;
					line-height: 60rpx;
					overflow: hidden;
					border-radius: 60rpx;

					&.choose {
						background-color: #4d7df9;
						color: #fff;
					}

					&.nolm {
						color: #fff;
						opacity: 0.3;
					}
				}
				.isWorkDay {
					color: #42464a;
				}

				.notSigned {
					font-style: normal;
					width: 8rpx;
					height: 8rpx;
					background: #fa7268;
					border-radius: 10rpx;
					position: absolute;
					left: 50%;
					bottom: 0;
					pointer-events: none;
				}
				.today {
					color: #fff;
					background-color: #a8c0ff;
				}
				.workDay {
					font-style: normal;
					width: 8rpx;
					height: 8rpx;
					background: #4d7df9;
					border-radius: 10rpx;
					position: absolute;
					left: 50%;
					bottom: 0;
					pointer-events: none;
				}
				.markDay {
					font-style: normal;
					width: 8rpx;
					height: 8rpx;
					background: #fc7a64;
					border-radius: 10rpx;
					position: absolute;
					left: 50%;
					bottom: 0;
					pointer-events: none;
				}
			}
		}
	}

	.hide {
		height: 80rpx !important;
	}

	.weektoggle {
		width: 85rpx;
		height: 32rpx;
		position: relative;
		bottom: -42rpx;
		&.down {
			transform: rotate(180deg);
			bottom: 0;
		}
	}
}
</style>
